-----------------
Client program or application/
Application user side/
UI/
(Browser, desktop & mobile apps)

	- Asks query (client/customer/user 1)
	- Show response (client/customer/user 2 .. N)
	- Examples:
		○ Web
			§ JavaScript  (in combination with one of others)
			§ Typescript
				□ JavaScript  wrapper
				□ with upcoming JavaScript futures
			§ Angular (Typescript is must after Angular version 2+)
			§ React.js
			§ Vue.js
		○ Desktop
			§ C#.NET WPF (xaml + c#), Windows Forms (c#)
			§ VB.NET


Application Server program or application/
/ mostly Remote machine

	- Store in Database server
	- Calculates/ processes
	- Gives response to client's query
	- Examples
		○ Java       60+% jobs
		○ C#          20+% jobs
		○ Node.js  5%
		○ Python   5% (in combination with one of above)
		○ Other (PHP)


Database Server
- Store data (access is slow because file access)
- Examples
	- Relational (RDBMS) (Tables)
		○ Oracle
		○ MS Sql server
	- No Sql (JSONs)
		○ MongoDb
		○ CouchDB
	- Graph Db
		○ Neo4j
		

Clould
	- AWS
	- Azure
	- GCP Google cloud platform
	- All the servers can be in cloud, some times client can be in cloud too.

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-----------------
Open sources
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Git
    Git is a free and
        open source distributed version control system designed to handle everything from small to very large projects with speed and efficiency. Git is easy to learn and has a tiny footprint with lightning fast performance.
Visualstudio code
    https://code.visualstudio.com/
    https://code.visualstudio.com/insiders/


        git config user.email "[email protected]"
        git config user.name "aa"

        git config credential.helper store
        git push

    Visual Studio Code is a source-code editor developed by Microsoft for Windows, Linux and macOS.[7] It includes support for debugging, embedded Git control and GitHub, syntax highlighting, intelligent code completion, snippets, and code refactoring. It is highly customizable, allowing users to change the theme, keyboard shortcuts, preferences, and install extensions that add additional functionality. The source code is free and
        open source and released under the permissive MIT License.[8] The compiled binaries are freeware and free for private or commercial use.[9]
KDiff3
    KDiff3 is a free,
        open source and cross-platform tool designed to analyze text difference and merge files or directories.
    http://kdiff3.sourceforge.net/